A player and his group took most of what exists in the D20 Modern books and created a 4E version, modifying classes and such to fit in to 4E's layout of "Class -> Paragon Path -> Epic Destiny." They even went so far as to give it a similar format and appearance to that of an official product.

This is a non-professional document but its well made and the volume of things covered is amazing.
If you have rules questions you can reach the author Orion Ussner Kidder on the modern database (user name Orion) : http://community.d20moderndb.com/viewforum.php?f=20

Hopefully, this fits this category. I generally tend to add one or more post a month, some goofy but all entertaining I hope. Much of this eventually makes its way into actual releases from NUELOW Games (or already has).